Grinding and polishing machine.



' A. c. BOYLE, JR. GRINDING AND POLISHING MACHINE.

APPLICATION FILED JAN-151915- I Patented May 9,1916.

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from the union upwardly in the direction of the shaft of the lap 10, and at a point jacent thesame, downwardly to a point 1n closeproxmiity to the central portion of the grinding surface of the wheel.

In the operation of the grinding machine, the specimens secured at the lower ends of the holders on the carriers 13, are by spring pressure as well as by gravity, maintained in frictional engagement with the upper or grinding surface of thelap-wheel. The motormounted in the base of the machine imparts. through the medium of its rotor, a rotary movement to the lap -wheel about its vertical axis and it effects simultaneously through the intermediary of the transmission devices operatively connected with the upper end of the shaft 10, rotary movements to the carriers. The specimens at the ends of the holders are thus moved across the lap in circular paths while the lap itself rotates about its axis in the direction of the arrow shown in Fig. 2, with the result that the specimens are presented to the grinding force in an infinite number of posltlons, and every part of each specimen, lrrespective of its structure, will thus at one time or another be subjected to the grindingor polishing action of the abradants on the lap. At the initial point 'in the operation of the machine,a suitable pulverulous abradant is supplied together with a liquid, to the grinding surface of the lap wheel. As the lapwheelrotates at a'comparatively high rate of speed, thev materials are after their ac tion upon the specimens with which the lap engages, impelled by centrifugal force to the periphery of the wheel and into the concavity of its'upwardly curving rim. The constituents of the material are by the same force. classified in concentric layers within the concavity in accordance with their different specific gravities, the coarsest matter being outermost as shown at A in Fig. 3, the lightest material, innermost asat B, and the matter of intermediate size or weight at points between thetwo extreme layers as indicated at C.

During the rotary movement of the lap, the matter in which the end of the conduit member 25 extends, is drawn into and through the, conduit 21 to be delivered through the orifice of the member 26 onto the, central: portion of the grinding surface of, the wheel, and by changing the position of the member 25 with relation to the rim of the wheel by adjustment of the screw 24:, its extremity may be placed within any one of the layers of abrasive matter within the concavity of the rim and the 7 character of the abradant which'by means of the conduit is continuously fed onto the central portion of the grinding surface may thus-be readily varied in accordance with the requirements of the specimens under.

treatment.

The amounts of the abradant andyliq-uid supplied to the central portion of the lapwheel through the conduit 21 must necessarily be proportionate to the rate at which;

it is used at the points at which the grinding action takes place, and'while in the drawingsbut one conduit has been shown, it will be understood that if so desired, two or more conduits may be similarly,

mounted on the machine to simultaneously feed the abrasive and the liquid ontothe I centralportion of the lap-wheel.

From the above description it will beseen that by the use ofmy improved lap-wheel and the therewith cooperative means, abradants of different degrees of coarseness or hardness, selected while the machine is in-operation, are automatically feedingand continuously supplied to the part of theq lap-surface at which the grinding action takes place. A p

Having thus described my invention what I claim and desire to secure byoLett'ers- -Patent is: V I

1. In agrinding and polishing machine, a rotary lap-wheel having a peripheral recess to retain materialimpelled across its face by centrifugal force, and adjustable means adapted to automatically convey mat:- ter. from a selected point in said recess, to a more'central portion of' the said face.

2. In a grindingand polishingmachine a rotary lap-wheel having a peripheral recess to retain material impelled across its face by centrifugal force, and a conduithaving an inlet within said recess and an out; let nearer the central portion of the said" face.

3. In a grindingand polishingmachine, V

ten retained by said rim toapoint nearerthe center of the said face. r

5. In a grinding, andpolishingmachine', a rotarylap-wheel having an upwardly ex-" tending rirnfor retaining =matter impelled;

across its face by centrifugal force,-, and a5- conduit having an inlet adjacent said rim and an outlet nearer the center of the said I I face.

6. In a grinding and polishing machine, a rotary lap wheel having an upwardly extending rim for retaining matter impelled across its face by centrifugal force, and adjustable means adapted to automatically convey matter retained by said rim, from a selected distance from the same to a point nearer the center of the said face.

7. In a grinding and polishing machine, a rotary lap-wheel having an upwardly extending rim for retaining matter impelled across its face by, centrlfugal force, and a conduit having one of its ends extending adjacent said rim in a direction opposite to that in which the lap wheel rotates and having its opposite end disposed nearer the center of the said face. I

8. In a grindingand polishing machine,

a rotary lap-wheel having anupwardly eX-,

tending rim for retaining matter impelled across its face by centrifugal force, a stationary bearing, an adjusting screw movably mounted thereon, and a conduit supported on said screw and having an inlet adjacent said rim and an outlet nearer the center of the said face.

9. Ina grinding and polishing machine, a rotary lap-wheel having an upwardly ex- 7 tending rim for retaining matter impelled across its face by centrifugal force, and a conduit having one of its ends extending adjacent said rim,and at its said end an inlet face opposite to the direction in which the lap-wheel rotates and having its opposide end disposed nearer the center of the said face.

10. In a grinding and polishing machine, a rotary lap-wheel having a peripheral reface by centrifugal force, and a conduit having an inlet within the recess and an out-' let nearer the center of the said face, the said conduit being adjustable to vary the position of an end thereof in a substantially horizontal plane with relation to the center of the wheel.

11. In a grinding and polishing machine, a rotary lap-wheel having a peripheral recess to retain material impelled across its face by. centrifugal force, and a conduit having an inlet within the recess and an outlet nearer the center and adjacent the surface of the said face, thesaid conduit being arched to permit of the passage of articles between its ends during rotation of the wheel.

12. In agrinding and polishing machine, a rotary lap-wheel having an upwardly extending and interiorly concave rim for retaining matter impelled across its face by centirifugal force, and means adapted td"aut0- matically convey matter retained by said rim, to a point nearer the center of the wheel.

13. In a grinding and polishing machine, a rotary lap-wheel having an upwardly extending and interiorly concave rim and adjoining the same, an annular depression for retaining matter impelled across its face by U centrifugal force, and 'means adapted to automatically convey matter retained by said rim, to a point nearer the center of the Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patent.

Washington, D. G. i 

